[UX] Update and Backup text improvements

[jenlampton]

0. When running updates, the first step of the process contains the paragraph For more detailed information, see the [Upgrading Backdrop CMS](https://backdropcms.org/upgrade) page. If you are unsure of what these terms mean, contact your hosting provider.

I would recommend removing the second sentence -- what is a hosting provider going to do if you don't understand these terms?

1. The title of the backup page is Pre-update backup , both of these words are both verbs and nouns, so this is confusing in english and also may not translate well.

Could we change this to a complete sentence?

The title on both the previous and next step is Backdrop site update so maybe this page could be Backdrop backup process

something like "Create a backup"?

2. This paragraph: If skipping the backup process, please ensure you create a backup through a different mechanism, such as through your hosting provider.

• I am not skipping the "backup process" if I have done it elsewhere, just skipping it here.
• If we remove 'ensure you` the intent is the same and the language is more simple.
• I would not call a hosting provider a mechanism.
• Hosting provider also assumes the update is being run remotely, but I run a lot more updates locally than remotely. (Does this matter?)

How about something like...
If skipping the backup process here, please create a backup elsewhere, such as through your hosting provider.

3. This paragraph: Backups are not available because the variable $settings['backup_directory'] has not been set in settings.php.

I nearly missed this because it's below a bunch of other text, and formatted the same way as everything above. I would prefer to see this formatted as warning, or at least an info message, and maybe also displayed at the top of the page.

4. this paragraph: The backup process may take several minutes, depending on the size of your database.

The comma is not necessary

Steps To Reproduce

To reproduce the behavior:

1. Go to 'core/update.php'

Additional information

Add any other information that could help, such as:

• Backdrop CMS version:
• Web server and its version:
• PHP version:
• Database sever (MySQL or MariaDB?) and its version:
• Operating System and its version:
• Browser(s) and their versions:

[jenlampton]

I've made the changes, I'm not sure this a good way to get the info messaging styling, but it seems to work 🤷‍♀️